<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title>改变复选框边框颜色</title>
		<style type="text/css">
			input {
				width: 20px;
			height: 20px;
			border: none;
			background-color: red;
			}
			
		</style>
	</head>

	<body>
		<input type="checkbox" name="" id="" value="" />
	</body>

</html>